backup

package
v15.4.0 Latest Latest
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 Go to latest Published: Sep 21, 2022 License: MIT Imports: 28 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (
	// ErrSkipped means the repository was skipped because there was nothing to backup
	ErrSkipped = errors.New("repository skipped")
	// ErrDoesntExist means that the data was not found.
	ErrDoesntExist = errors.New("doesn't exist")
)

Functions

func LazyWrite 

func LazyWrite(ctx context.Context, sink Sink, relativePath string, r io.Reader) error

LazyWrite saves all the data from the r by relativePath and will only create a file if there is data to be written.

Types

type Backup 

type Backup struct {
	// Steps are the ordered list of steps required to restore this backup
	Steps []Step
}

Backup represents all the information needed to restore a backup for a repository

type Command 

type Command interface {
	Repository() *gitalypb.Repository
	Name() string
	Execute(context.Context) error
}

Command handles a specific backup operation

type CreateCommand 

type CreateCommand struct {
	// contains filtered or unexported fields
}

CreateCommand creates a backup for a repository

func NewCreateCommand 

func NewCreateCommand(strategy Strategy, server storage.ServerInfo, repo *gitalypb.Repository, incremental bool) *CreateCommand

NewCreateCommand builds a CreateCommand

func (CreateCommand) Execute 

func (cmd CreateCommand) Execute(ctx context.Context) error

Execute performs the backup

func (CreateCommand) Name 

func (cmd CreateCommand) Name() string

Name is the name of the command

func (CreateCommand) Repository 

func (cmd CreateCommand) Repository() *gitalypb.Repository

Repository is the repository that will be acted on

type CreateRequest 

type CreateRequest struct {
	Server      storage.ServerInfo
	Repository  *gitalypb.Repository
	Incremental bool
}

CreateRequest is the request to create a backup

type FilesystemSink 

type FilesystemSink struct {
	// contains filtered or unexported fields
}

FilesystemSink is a sink for creating and restoring backups from the local filesystem.

func NewFilesystemSink 

func NewFilesystemSink(path string) *FilesystemSink

NewFilesystemSink returns a sink that uses a local filesystem to work with data.

func (*FilesystemSink) GetReader 

func (fs *FilesystemSink) GetReader(ctx context.Context, relativePath string) (io.ReadCloser, error)

GetReader returns a reader of the requested file path. It's the caller's responsibility to Close returned reader once it is not needed anymore. If relativePath doesn't exist the ErrDoesntExist is returned.

func (*FilesystemSink) Write 

func (fs *FilesystemSink) Write(ctx context.Context, relativePath string, r io.Reader) (returnErr error)

Write creates required file structure and stored data from r into relativePath location. If created file is empty it will be removed.

type LegacyLocator 

type LegacyLocator struct{}

LegacyLocator locates backup paths for historic backups. This is the structure that gitlab used before incremental backups were introduced.

Existing backup files are expected to be overwritten by the latest backup files.

Structure: 

<repo relative path>.bundle
<repo relative path>.refs
<repo relative path>/custom_hooks.tar

func (LegacyLocator) BeginFull 

func (l LegacyLocator) BeginFull(ctx context.Context, repo *gitalypb.Repository, backupID string) *Step

BeginFull returns the static paths for a legacy repository backup

func (LegacyLocator) BeginIncremental 

func (l LegacyLocator) BeginIncremental(ctx context.Context, repo *gitalypb.Repository, backupID string) (*Step, error)

BeginIncremental is not supported for legacy backups

func (LegacyLocator) Commit 

func (l LegacyLocator) Commit(ctx context.Context, full *Step) error

Commit is unused as the locations are static

func (LegacyLocator) FindLatest 

func (l LegacyLocator) FindLatest(ctx context.Context, repo *gitalypb.Repository) (*Backup, error)

FindLatest returns the static paths for a legacy repository backup

type Locator 

type Locator interface {
	// BeginFull returns a tentative first step needed to create a new full backup.
	BeginFull(ctx context.Context, repo *gitalypb.Repository, backupID string) *Step

	// BeginIncremental returns a tentative step needed to create a new incremental backup.
	BeginIncremental(ctx context.Context, repo *gitalypb.Repository, backupID string) (*Step, error)

	// Commit persists the step so that it can be looked up by FindLatest
	Commit(ctx context.Context, step *Step) error

	// FindLatest returns the latest backup that was written by Commit
	FindLatest(ctx context.Context, repo *gitalypb.Repository) (*Backup, error)
}

Locator finds sink backup paths for repositories

func ResolveLocator 

func ResolveLocator(layout string, sink Sink) (Locator, error)

ResolveLocator returns a locator implementation based on a locator identifier.

type LoggingPipeline 

type LoggingPipeline struct {
	// contains filtered or unexported fields
}

LoggingPipeline outputs logging for each command executed

func NewLoggingPipeline 

func NewLoggingPipeline(log logrus.FieldLogger) *LoggingPipeline

NewLoggingPipeline creates a new logging pipeline

func (*LoggingPipeline) Done 

func (p *LoggingPipeline) Done() error

Done indicates that the pipeline is complete and returns any accumulated errors

func (*LoggingPipeline) Handle 

func (p *LoggingPipeline) Handle(ctx context.Context, cmd Command)

Handle takes a command to process. Commands are logged and executed immediately.

type Manager 

type Manager struct {
	// contains filtered or unexported fields
}

Manager manages process of the creating/restoring backups.

func NewManager 

func NewManager(sink Sink, locator Locator, pool *client.Pool, backupID string) *Manager

NewManager creates and returns initialized *Manager instance.

func (*Manager) Create 

func (mgr *Manager) Create(ctx context.Context, req *CreateRequest) error

Create creates a repository backup.

func (*Manager) Restore 

func (mgr *Manager) Restore(ctx context.Context, req *RestoreRequest) error

Restore restores a repository from a backup.

type ParallelPipeline 

type ParallelPipeline struct {
	// contains filtered or unexported fields
}

ParallelPipeline is a pipeline that executes commands in parallel

func NewParallelPipeline 

func NewParallelPipeline(next Pipeline, parallel, parallelStorage int) *ParallelPipeline

NewParallelPipeline creates a new ParallelPipeline where all commands are passed onto `next` to be processed, `parallel` is the maximum number of parallel backups that will run and `parallelStorage` is the maximum number of parallel backups that will run per storage. Since the number of storages is unknown at initialisation, workers are created lazily as new storage names are encountered.

Note: When both `parallel` and `parallelStorage` are zero or less no workers are created and the pipeline will block forever.

func (*ParallelPipeline) Done 

func (p *ParallelPipeline) Done() error

Done waits for any in progress calls to `next` to complete then reports any accumulated errors

func (*ParallelPipeline) Handle 

func (p *ParallelPipeline) Handle(ctx context.Context, cmd Command)

Handle queues a request to create a backup. Commands are processed by n-workers per storage.

type Pipeline 

type Pipeline interface {
	Handle(context.Context, Command)
	Done() error
}

Pipeline executes a series of commands and encapsulates error handling for the caller.

type PipelineError 

type PipelineError []error

PipelineError represents a summary of errors by repository

func (*PipelineError) AddError 

func (e *PipelineError) AddError(repo *gitalypb.Repository, err error)

AddError adds an error associated with a repository to the summary.

func (PipelineError) Error 

func (e PipelineError) Error() string

type PointerLocator 

type PointerLocator struct {
	Sink     Sink
	Fallback Locator
}

PointerLocator locates backup paths where each full backup is put into a unique timestamp directory and the latest backup taken is pointed to by a file named LATEST.

Structure: 

<repo relative path>/LATEST
<repo relative path>/<backup id>/LATEST
<repo relative path>/<backup id>/<nnn>.bundle
<repo relative path>/<backup id>/<nnn>.refs
<repo relative path>/<backup id>/<nnn>.custom_hooks.tar

func (PointerLocator) BeginFull 

func (l PointerLocator) BeginFull(ctx context.Context, repo *gitalypb.Repository, backupID string) *Step

BeginFull returns a tentative first step needed to create a new full backup.

func (PointerLocator) BeginIncremental 

func (l PointerLocator) BeginIncremental(ctx context.Context, repo *gitalypb.Repository, fallbackBackupID string) (*Step, error)

BeginIncremental returns a tentative step needed to create a new incremental backup. The incremental backup is always based off of the latest full backup. If there is no latest backup, a new full backup step is returned using fallbackBackupID

func (PointerLocator) Commit 

func (l PointerLocator) Commit(ctx context.Context, step *Step) error

Commit persists the step so that it can be looked up by FindLatest

func (PointerLocator) FindLatest 

func (l PointerLocator) FindLatest(ctx context.Context, repo *gitalypb.Repository) (*Backup, error)

FindLatest returns the paths committed by the latest call to CommitFull.

If there is no `LATEST` file, the result of the `Fallback` is used.

type RestoreCommand 

type RestoreCommand struct {
	// contains filtered or unexported fields
}

RestoreCommand restores a backup for a repository

func NewRestoreCommand 

func NewRestoreCommand(strategy Strategy, server storage.ServerInfo, repo *gitalypb.Repository, alwaysCreate bool) *RestoreCommand

NewRestoreCommand builds a RestoreCommand

func (RestoreCommand) Execute 

func (cmd RestoreCommand) Execute(ctx context.Context) error

Execute performs the restore

func (RestoreCommand) Name 

func (cmd RestoreCommand) Name() string

Name is the name of the command

func (RestoreCommand) Repository 

func (cmd RestoreCommand) Repository() *gitalypb.Repository

Repository is the repository that will be acted on

type RestoreRequest 

type RestoreRequest struct {
	Server       storage.ServerInfo
	Repository   *gitalypb.Repository
	AlwaysCreate bool
}

RestoreRequest is the request to restore from a backup

type Sink 

type Sink interface {
	// Write saves all the data from the r by relativePath.
	Write(ctx context.Context, relativePath string, r io.Reader) error
	// GetReader returns a reader that servers the data stored by relativePath.
	// If relativePath doesn't exists the ErrDoesntExist will be returned.
	GetReader(ctx context.Context, relativePath string) (io.ReadCloser, error)
}

Sink is an abstraction over the real storage used for storing/restoring backups.

func ResolveSink 

func ResolveSink(ctx context.Context, path string) (Sink, error)

ResolveSink returns a sink implementation based on the provided path.

type Step 

type Step struct {
	// BundlePath is the path of the bundle
	BundlePath string
	// SkippableOnNotFound defines if the bundle can be skipped when it does
	// not exist. This allows us to maintain legacy behaviour where we always
	// check a specific location for a bundle without knowing if it exists.
	SkippableOnNotFound bool
	// RefPath is the path of the ref file
	RefPath string
	// PreviousRefPath is the path of the previous ref file
	PreviousRefPath string
	// CustomHooksPath is the path of the custom hooks archive
	CustomHooksPath string
}

Step represents an incremental step that makes up a complete backup for a repository

type StorageServiceSink 

type StorageServiceSink struct {
	// contains filtered or unexported fields
}

StorageServiceSink uses a storage engine that can be defined by the construction url on creation.

func NewStorageServiceSink 

func NewStorageServiceSink(ctx context.Context, url string) (*StorageServiceSink, error)

NewStorageServiceSink returns initialized instance of StorageServiceSink instance. The storage engine is chosen based on the provided url value and a set of pre-registered blank imports in that file. It is the caller's responsibility to provide all required environment variables in order to get properly initialized storage engine driver.

func (*StorageServiceSink) Close 

func (s *StorageServiceSink) Close() error

Close releases resources associated with the bucket communication.

func (*StorageServiceSink) GetReader 

func (s *StorageServiceSink) GetReader(ctx context.Context, relativePath string) (io.ReadCloser, error)

GetReader returns a reader to consume the data from the configured bucket. It is the caller's responsibility to Close the reader after usage.

func (*StorageServiceSink) Write 

func (s *StorageServiceSink) Write(ctx context.Context, relativePath string, r io.Reader) error

Write stores data from the r into a relativePath path on the configured bucket.

type Strategy 

type Strategy interface {
	Create(context.Context, *CreateRequest) error
	Restore(context.Context, *RestoreRequest) error
}

Strategy used to create/restore backups

Source Files

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